Unfortunately, for most people the fact that it's part of Emacs is a blocker.
And because most people use worse Git tools, they tend to use workflows that are easier with more cumbersome tools; generally just committing all kinds of junk commits to a branch, and using the "squash and merge" feature of GitHub or GitLab to clean everything in a PR/MR up into a single commit.
So yeah, it's sad that people don't use Git to its full potential because almost no other Git interface works as well, and most people aren't going to learn Emacs just for a Git UI.
Unfortunately, for most people the fact that it's part of Emacs is a blocker.
And because most people use worse Git tools, they tend to use workflows that are easier with more cumbersome tools; generally just committing all kinds of junk commits to a branch, and using the "squash and merge" feature of GitHub or GitLab to clean everything in a PR/MR up into a single commit.
So yeah, it's sad that people don't use Git to its full potential because almost no other Git interface works as well, and most people aren't going to learn Emacs just for a Git UI.